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Hsu, Ching-Kun; Hwang, Gwo-Jen – Interactive Learning Environments, 2014
Personal computer assembly courses have been recognized as being essential in helping students understand computer structure as well as the functionality of each computer component. In this study, a context-aware ubiquitous learning approach is proposed for providing instant assistance to individual students in the learning activity of a…
Descriptors: Electronic Learning, Educational Technology, Comparative Analysis, Conventional Instruction
Barnow, Burt S.; And Others – 1980
Selectivity bias arises in program evaluation when the treatment or control status of the subjects is related to unmeasured characteristics that themselves are related to the program outcome under study. This situation has the potential to lead to an incorrect estimation of the treatment effect when assignment to treatment and control groups is…
Descriptors: Control Groups, Evaluation Methods, Experimental Groups, Models